Radio receiving system for aeroplanes



, 1937. 5. J. LEVY RADIO RECEIVING SYSTEM FOR AEROPLANE DecQZl Filed Feb. 20, 1929 1 ATTORNEY Patented Dec. 21, 1937 RADIO RECEIVING SYSTEM FOR AERO- PLANES Sol J. Levy, New York, N. Y.

Application February 20, 1929, Serial No. 341,295 1 Claim. (01. 25020) UNITED STATES PATENT OFFICE It is an object of my invention to provide a radio receiving system for aeroplanes and aircraft, the radio frequency stages and audio amplification stages of which may be positioned in portions of the plane or aircraft removed from the instrument dash so as to avoid any possible inductive or magnetic interference or other interference with the instruments on the instrument panel board, and to avoid interference and noises caused by the ignition system when in close proximity to the motor. I may, of course, locate the entire radio receiving set at a properly balanced point in the tail of the plane or I may locate the same in one or more of the wings, and control the entire operation of the receiving set from a remote point or from instrument panel board.

Other objects of my invention will more fully appear from the following description.

The figure is a diagrammatic sketch in perspective elevation and partly in section showing a preferred embodiment of my device; I is a typical aeroplane; 2 shows :an audio amplifying stage of a radio receiving set located in the left wing; 3 shows a radio frequency portion of said I set located in the right wing suitably connected by cables as indicated; 4 shows a complete radio receiving set located in balanced position in the tail of the plane suitably connected by cables to the operators head phones or loud speaker and to the remote control unit 5.

The general method of operation of my radio receiving stage whether located in one wing or in the tail of an aeroplane, or other positions in aircraft, is fully described in my co-pending application for Automatic remote control radio receiving set bearing Serial No. 55,989. It will ap ear that I utilize a motor or electric magnetic driving means for the tuning portion of the set, said driving means being controlled at a remote point by a forward and back push button or switch and said remote means being provided with a volume control, also a meter calibrated to read the radio frequency at which the set may be tuned from time to time.

It will appear that I operate the tuning portions of radio frequency stages by a small electric motor utilizing the electrical source energy of the receiving set and operated by tuning push buttons connected with the remote control unit 5. I also have a small volume control connected to the remote control unit at 8 and the dial 9 is connected to the same electrical energy source of the set through a resistance unit (not shown) which resistance unit is varied simultaneously with the tuning of the set and causes the dial to register proportionately to the radio frequency at which the set is receiving, all of which is fully described in my aforesaid co-pending application. It is of course evident that I may locate my audio amplifying stage separate and apart from my radio frequency stage without change in the general method of control and general scope of my invention.

Having thus described my invention, what I claim and desire .to secure by United States Letters Patent is:

A radio receiving system for aircraft having the radio frequency portion thereof remotely situated from the operators instrument panel in one wing of said plane, the audio amplifying stage of said set similarly situated and balanced in an opposite wing of said plane, said radio frequency portion being tuned by means controlled from said panel, said audio amplifier being controlled from said panel, said panel having visible dial indication means for showing the wave length to which said set is tuned.

SOL J. LEVY. 

